Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43f4e5b9c177514…

MALICIOUS

PDF

59.9 KB Created: 2020-12-14 06:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ebc7464e4fd109642b0ed9369b2bee67 SHA-1: dbc3ce9ed7dc14f2e5392813d420a85f2e87c875 SHA-256: b43f4e5b9c177514db2f843a0d872d1650bca6e360b4832db94109fb51d52a91
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/strik?utm_term=hello+kitty+mirror+compact PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fc4c4df5270d.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/fatitadajix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500878/normal_5fc50de1cbf02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5f962cb21012a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5fcad27e2847a.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/7898680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49675147b1480429382c/1606371688023/edjing_5_pro_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50dfce5c7695ca9b64519/t/5fd1d3c923f2866aa38a4e39/1607586765808/46683702290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00f31eb-0b86-4200-a306-3bcc807cc5aa/ect2000_short_open_circuit_detector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db67a5e-d491-4697-9185-fe4df8504a01/kllarn_frtnas_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43cf757-eaca-4983-b4ad-59aad90dad58/jim_cramer_real_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4a28139af037644e7e6/t/5fc13dcfa97599144e24cda0/1606499793967/92823029345.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f3b9a5bc066edfb302dc/t/5fd0a5b60c0c9b10ab0d1c8b/1607509434684/71926816038.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0C 5028 bytes
SHA-256: c60a59c8605277ad5a9057960bedb554f7938025466618d34bbb69f0f811ff1d
font_01_sfnt_off0000bf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF19 10620 bytes
SHA-256: 5b1a70b8fbdff3e1c851e5165180cddf56c547cbcc8e281980245c8e9113b1d2

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